Rubber composition and pneumatic tire using the rubber composition

- Bridgestone Corporation

The present invention provides a rubber composition comprising natural rubber and/or diene synthetic rubbers, silica in an amount of 10 to 85 parts by weight per 100 parts by weight of the rubber, a specific silane coupling agent, i.e., a bis-(alkoxysilylalkyl) polysulfide having a polysulfide structure in which the distribution of sulfur is specified, in an amount of 1 to 20% by weight of the amount of silica, and provides a pneumatic tire manufactured by using the rubber composition. The pneumatic tire has excellent low heat buildup property, low rolling resistance, and reinforcing property.

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Claims

1. A rubber composition which comprises a rubber component comprising

at least one member selected from the group consisting of natural rubber and diene synthetic rubbers; silica in an amount of 10 to 85 parts by weight per 100 parts by weight of the rubber component; and in an amount of 1 to 20% by weight of the amount of silica, a silane coupling agent represented by the following general formula:
wherein n represents an integer of 1 to 3, m represents an integer of 1 to 9, y represents a positive number of 1 or more having a distribution, the distribution of --S.sub.y -- satisfying the relation:
and the content of component S.sub.3 is 19.4% or more.

2. A rubber composition according to claim 1, wherein the distribution of --S.sub.y -- satisfies the relation:

3. A rubber composition according to claim 1, wherein the distribution of --S.sub.y -- satisfies the relation:

4. A rubber composition according to claim 1, further comprising 80 parts by weight or less of carbon black as a reinforcing filler per 100 parts by weight of the rubber component.

5. A rubber composition according to claim 2, further comprising 80 parts by weight or less of carbon black as a reinforcing filler per 100 parts by weight of the rubber component.

6. A rubber composition according to claim 3, further comprising 80 parts by weight or less of carbon black as a reinforcing filler per 100 parts by weight of the rubber component.

7. A rubber composition according to claim 1, wherein anhydrous sodium sulfide (Na.sub.2 S) and sulfur (S) are reacted with each other in a mol ratio in a range of 1:1 to 1:2.5 in an atmosphere of an inert gas in a polar solvent to obtain sodium polysulfide, the obtained sodium polysulfide is reacted in an atmosphere of an inert gas with a halogenoalkoxysilane represented by the following general formula: ##STR3## wherein R.sup.1 and R.sup.2 each represents an alkyl group having 1 to 3 carbon atoms, R.sup.3 represents a divalent hydrocarbon group having 1 to 9 carbon atoms, X represents a halogen atom, and k represents an integer of 1 to 3, and the obtained compound is used as the silane coupling agent.

8. A rubber composition according to claim 2, wherein anhydrous sodium sulfide (Na.sub.2 S) and sulfur (S) are reacted with each other in a mol ratio in a range of 1:1 to 1:2.5 in an atmosphere of an inert gas in a polar solvent to obtain sodium polysulfide, the obtained sodium polysulfide is reacted in an atmosphere of an inert gas with a halogenoalkoxysilane represented by the general formula of claim 7, and the obtained compound is used as the silane coupling agent.

9. A rubber composition according to claim 3, wherein anhydrous sodium sulfide (Na.sub.2 S) and sulfur (S) are reacted with each other in a mol ratio in a range of 1:1 to 1:2.5 in an atmosphere of an inert gas in a polar solvent to obtain sodium polysulfide, the obtained sodium polysulfide is reacted in an atmosphere of an inert gas with a halogenoalkoxysilane represented by the general formula of claim 7, and the obtained compound is used as the silane coupling agent.

10. A pneumatic tire which is manufactured by using the rubber composition described in claim 1 for tread rubber.

11. A pneumatic tire which is manufactured by using the rubber composition described in claim 2 for tread rubber.

12. A pneumatic tire which is manufactured by using the rubber composition described in claim 3 for tread rubber.

13. A pneumatic tire which is manufactured by using the rubber composition described in claim 4 for tread rubber.

14. A pneumatic tire which is manufactured by using the rubber composition described in claim 5 for tread rubber.

15. A pneumatic tire which is manufactured by using the rubber composition described in claim 6 for tread rubber.

16. A pneumatic tire which is manufactured by using the rubber composition described in claim 7 for tread rubber.

Referenced Cited
U.S. Patent Documents
5580919 December 3, 1996 Agostini et al.
Foreign Patent Documents
5029741 September 1975 JPX
5120208 June 1976 JPX
3252431 November 1991 JPX
7228588 August 1995 JPX
A10732362 September 1996 JPX
Other references
  • Chem Abstract 128:116176 "Rubber Compositions and Pneumatic Tires Procduced Therefrom Draki et al."
Patent History
Patent number: 5948842
Type: Grant
Filed: Aug 25, 1997
Date of Patent: Sep 7, 1999
Assignee: Bridgestone Corporation (Tokyo)
Inventors: Shunji Araki (Tokyo), Kazuhiro Yanagisawa (Tokyo)
Primary Examiner: Duc Truong
Law Firm: Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
Application Number: 8/917,234